1,2-Benzenedicarboxylic acid, 3-(4-(1-(4-(3,4-dicarboxyphenoxy)phenyl)-1-methylethyl)phenoxy)-, tetrasodium salt 2-(4-(2,3-Dicarboxyphenoxy)phenyl)-2-(4-(3,4-dicarboxyphenoxy)phenyl)propane, tetrasodium salt 72066-80-9